asakiyume: created by the ninja girl (Default)
[personal profile] asakiyume
In this video, a guy pours couscous over a plate and plays the edge of the plate with a bow to make musical vibrations, which then causes the couscous to move into beautiful patterns.

This inspired me to try similar, except I don't have a thin metal plate or a bow--or, right at the moment, couscous. What I do have is a cookie sheet, rice, and a saw. So!

Here's the rice on the cookie sheet:

random rice

Here it is after I shook the tray back and forth. The way I was shaking it, the rice all clustered together like a murmuration of starlings:

rice when I've shaken the sheet

Here's a roll of duct tape on the floor. I'm going to set the tray on it and then bang the saw over the top of the tray:

base for the sheet, plus saw

Here's the tray in place ...

sheet on the base

And here's how I'm going to bang the saw:

how I'm going to vibrate the sheet

And here are the first results!

after vibration (1)

Not exactly symmetrical, but still very interesting! The rice collects where the sheet is *not* vibrating.

before vibration (2)

after vibration (2)

before vibration (3)

after vibration (3)

I am so science!!

Date: 2017-04-07 01:28 am (UTC)
sovay: (Cho Hakkai: intelligence)
From: [personal profile] sovay
Not exactly symmetrical, but still very interesting! The rice collects where the sheet is *not* vibrating.


That is neat. I have seen similar demonstrations done, but not with couscous. Or rice.

Date: 2017-04-07 06:29 am (UTC)
duccio: (Default)
From: [personal profile] duccio
Why don't you try using an electric razor (or a vibrator, should you happen to have one). It looks like he touched the edge of the plate here and there to get different patterns. Those are probably the nodal points to activate the harmonics of the plate - like harmonics on a guitar string, or a wind instrument's harmonic series, like for instance, on a trumpet.

I'm so science, too.

Date: 2017-04-07 11:29 am (UTC)
a_muse_d: (Default)
From: [personal profile] a_muse_d

Date: 2017-04-07 01:13 pm (UTC)
cmcmck: (Default)
From: [personal profile] cmcmck
Amazing stuff couscous but who knew just how amazing? :o)

Date: 2017-04-07 06:28 pm (UTC)
pameladean: (Default)
From: [personal profile] pameladean
You are totally science! I do wonder how people think of these things to start with.

I also wonder, after the comment immediately preceding this, what a mixture of different dry grains and sugar or whatever would do. Or maybe salt; then you could still cook them afterwards.


Date: 2017-04-09 11:24 am (UTC)
gaudior: (Default)
From: [personal profile] gaudior
That's so cool!

Date: 2017-04-10 12:14 am (UTC)
cgbookcat1: (giraffe)
From: [personal profile] cgbookcat1
When I teach the unit on waves to my college students, I always do this demonstration (with a fine sand). However, we have a tunable oscillation generator so that the entire thing bounces a bit, and no bow is necessary. At resonances the system gets very loud! It's a lot of fun to slowly turn up the frequency and watch patterns form, disappear, and be replaced by new ones. There are pattern differences between plate shapes, too -- we have a square and a circle.


asakiyume: created by the ninja girl (Default)

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